import pg from 'pg';
declare const pool: import("pg").Pool;
export declare function testConnection(): Promise<boolean>;
export default pool;
export declare function query<T = any>(text: string, params?: any[]): Promise<T[]>;
export declare function queryOne<T = any>(text: string, params?: any[]): Promise<T | null>;
export declare function transaction<T>(callback: (client: pg.PoolClient) => Promise<T>): Promise<T>;
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